Assuming their hearing is the same in both ears.
Quote Originally Posted by Gammaray View Post
You have been given some good theories here. However, perhaps it is time to experiment. My hypothesis is that the sound of both strokes should be very similar if arriving at the listener at the same distance and angle. This test cannot be made by the stropper, for good reasons already mentioned.

Have someone stand a few feet away, perpendicular to the strop. If your technique is good, then the sound difference should be very slight regardless of the grain of the leather. Better yet, have them close their eyes. It is my belief that "ceteris paribus" the sound should have very little difference. If the difference is significant, then I would no rule out modifying your touch and technique to achieve greater uniformity.